Sewing and embroidering machine with top feed and oscillating needle



March 24, 1936. UNGER 2,035,206

SEWING AND EMBROIDERING MACHI NE WITH TOP FEED AND OSCILLATING NEEDLE Filed July 10, 1951 2 Sheets-Sheet l March 24, 1936. H. UNGER 2,035,205

SEWING AND EMBROIDERING MACHINE WITH TOP FEED AND OSCILLATING NEEDLE Filed July 10, 1931 Sheets-Sheet 2 Patented Mar. 24, 1936 UNITED STATES SEWING AND EMBROIDERING MACHINE WITH TOP FEED AND OSCILLATING NEEDLEv Hugo Unger, Berlin, Germany, assignor to the firm Lintz & Eckhardt, Berlin, Germany Application July 10, 1931, Serial No. 549,890

In Germany July 16, 1930 4 Claims.

This invention relates to a sewing and embroidering machine with top feed, that is with a cloth feeder suspended oscillatable and liftable above the throat plate in which a thread or filler is tightly sewn on to the cloth by means of the zig-zag-shaped lock stitch, produced by an OS- cillatable needle. In such machines the cloth feed has hitherto been effected during every stitch of the needle, which oscillates transversely to the feed direction. The oscillating movement of the cloth feeder must in such machines not be less than a certain amplitude, as otherwise the cloth feed or transport will miss during rapid sewing. Consequently in such machines the sewn on decorative thread or filler was hitherto always more or less visible. It was impossible to cause the individual zig-zag-shaped stitches of the fastening thread to lie so close together, that the filler was completel covered, and to convert by means of the covering stitches of the fastening thread the filler into a thick cord of uniform appearance.

In order to be able to carry out such a stitch formation, which has already been obtained with straight line sewing machines with under feed, also on sewing and embroidering machines with top feed, the cloth feeder according to the invention is adapted to swing out at an oblique angle to the plane of the needle oscillation so that therefore the cloth feed takes place at an angle to the plane of the needle oscillation. The drive of the cloth feeder is further so arranged that the cloth feeder receives the swinging out movement, necessary for the cloth feed, only during each second needle oscillation. As, owing to the inclined oscillation of the cloth feeder, the needle is swung out in the plane of the one zig-zag stitch and the other or actually second zig-zag stitch occurs only during the simultaneous cloth feed, it is possible with the uniform progress of the zig-zag seam, for the mutual distance of the zigzag stitches to be reduced to half the size hitherto possible. The individual stitches consequently come to lie close together, so that the filler is almost completely enclosed by the sewing thread.

A particularly simple construction of the machine with a very clear running 01f of the insert thread is obtained, if the lower end of the main tube, rotatably surrounding the needle bar, is utilized not only for fitting the slidable guide for the transverse slide effecting the needle oscillation, but also for mounting the filler reel. In order to facilitate the changing and mounting of the needle bar, this bar is inserted with a thickened portion arranged on its upper end between two cheeks of a vertically reciprocating tube inserted in the main tube, and coupled for rotation with the main tube by means of a pin and slot connection.

An embodiment of the invention is illustrated by way of example in the accompanying drawings in which:

Fig. 1 is a side elevation of the new machine, partly in section,

Fig. 2 is an end elevation. 10

Fig. 3 is a cross section.

Fig. 4 shows on a larger scale the stitch formation, the cloth feed being so set, for the sake of clearness, that the individual zig-zag stitches can be easily seen.

The head plate of the machine plate 2 is 1 provided, in known manner, with guide eyes 3, 4 for the vertical main tube 5 of the machine, which rests, by means of. a flange 6, on the upper guide eye 3. The main tube is also rotated in known manner, by means of bevel wheels I, 8, from a crank, not shown, situated under the table plate. In the main tube 5 a tube 9 is inserted, which is carried by a vertically shiftable slide l0, guided in the head plate I. The tube 9 is shiftably guided in the main tube 5 by means of a pin l2, inserted in the flange 6 and extending into a slot II in the tube 9 being at the sametime coupled for rotation with the main tube 5, so that it is also rotated with the main tube. On the upper end of the vertically reciprocating tube 9 two cheeks I3 are provided, in which the widened head M of the tubular needle bar l5, extending downwards through the tube 9, is oscillatably suspended by means of a transverse pin IS. The up and down movement of the slide l0, carry-. ing the tube 6 and consequently also the needle I5, is effected by a disc I8 mounted on the main machine shaft l1 and gripping by nieans of an eccentrically arranged pin I9 between the lugs of the slide Ill.

The cloth feeder consists in known manner of a bent bar 2|, on the lower endof which a foot 23, provided with a rubber bearing ring 22, is clamped by a screw 24 above the throat plate 2|. The cloth feeder bar 2| is oscillatably suspended by means of a screw pin 25 on a ring 26 surrounding with clearance the main tube 5. which ring is oscillatable in known manner transversely to the vertical maintube axis by means of lateral journals 26'. The ring 26 operating like a Cardan joint is fitted on a slide 21, guided in the head plate I and acted upon by a downwardly pressing spring 28. The up and down movement of the cloth feeder 2|, 22

is derived from an auxiliary shaft 38, mounted in a hanging bracket 29, parallel to the main machine shaft H, a toothed wheel 3| on the auxiliary shaft meshing with a toothed wheel 32 keyed on the main machine shaft |1. As the toothed wheel 32 has only half as many teeth as the toothed wheel 3|, the auxiliary shaft 36 is r0 tated only at half the speed of the main shaft |1. On the auxiliary shaft a cam 33 is keyed, which acts on a roller 34 of a two-armed lever 35, which is oscillatably mounted on a pin 36 in the head plate I. The free end of this lever engages under a nose 31 of the feeder 21 carrying the cloth slide bar 2|. If the roller 34 is pressed down by the action of the cam 33, the slide 21 together with the ring 26 and cloth feeder bar 2 is raised in opposition to the action of the spring 28. As soon as the raised portion of the .cam 33 has passed the roller 34 the slide 21 together with the cloth feeder bar is again pressed downwards by the action of the spring 28. This up and down movement of the cloth feeder 2|, 22 takes place only after every second needle stitch or up and down movement of the needle, as it is derived from the auxiliary shaft 39, which rotates at half the speed of that of the main shaft and from the cam 33 of the same. f The feed movement of the cloth feeder 2|, 22 takes place through the intermediary of a cam 38 mounted on the main machine shaft I1, .a roller 39 of an elbow lever 4| oscillatably mounted on a pin 40 of the head plate I, bearing against the cam 38. The free end of this elbow lever engages over a nose 42 of a slide 43 vertically guided on the head plate I and acted upon'by a spring 44 pulling in upward direction. On the slide 43 an arm 45 is arranged, which carries a conical sleeve 46 slidably mounted on the main tube 5. The upper end of a two-armed lever 48 engages in a groove 41 in this conical sleeve 46 and is oscillatably mounted on a pin 49 on a sleeve 50 fixed on the main tube 5. This sleeve 58 can be clamped in any desired position of rotation on the main tube 5 by means of a fixing screw 5| The lower end of the lever 48 engages in a hole 53' of a ring disc 53 which is inserted loosely rotatable in a ring 52 of the cloth feeder bar 2|. The ring 53 has a rectangular hole 54 (Fig. 3) which engages around a square portion 55 of the sleeve 50. Sufficient clearance is provided between the hole 54 and the square 55, in order to allow a swinging out of the ring 52 and of the cloth feeder bar 2| carrying same. The direction of the swinging out, and therefore of the cloth feed is determined, as can be easily seen, by the position of rotation of the sleeve 50 having the square 55. The upper end of the lever 48 is maintained in permanent engagement with the groove 41 of the conical sleeve 46 by the action of springs 56, which connect the upper ring portion of the fixed sleeve 50 to the ring disc 53. If the elbow lever 4| is oscillated by the cam 38, the slide 43 together with the conical sleeve 46 is pressed downwards by this lever in opposition to the action of the spring 44. This however results in a swinging out of the lever 48 and through same of the cloth feeder bar 2|,

the conical sleeve 46 and also the cloth feeder bar 2| with ring 5| under the action of the springs 44 and 56.

In order that also this swinging out of the cloth feeder 2|, 22 derived from the cam 38, and also its lifting, occurs only after every second needle stitch or during each second needle oscillation, the cloth feeder is alternately released for oscillation during one revolution of the main machine shaft I1 and stopped during the following machine shaft revolution. For this purpose a grooved cam 51 is keyed on the main machine shaft H, and a roller 58 of a lever oscillatable on the pin 59 runs in the groove of this cam. This lever 60 has a nose 6|, by means of which it can engage over a pin 62 fitted on the elbow lever 4|.

As soon as a swinging out of the cloth feeder 2| 22 has taken place, namely whilst the roller 39 is still running on the raised portion of the cam 38, the lever 60 is oscillated by the action of the grooved cam 51 so that the nose 6| grips over the lever 4| still swung out. During the further rotation of the cam 38, the lever 4|, the slide 43 and. also the cloth feeder 2|, 22 are arrested so that no swinging back of the swung forward cloth feeder takes place. After one revolution of the main machine shaft H the lever 6|! is again turned into a position, in which its nose 6| does not impede the pin 62 and therefore the elbow lever 4|. Consequently, a lifting of the elbow lever 4| and of the slide 43 and swinging back of the cloth feeder 2|, 22 can only be effected by the roller 39 running off from the raised portion at the cam 38.

On the lower end of the main tube 5 a flange 63 is provided on which a slide guide 64 is fitted for a transversely movable slide 65. This slide 65 has'an eye 66, which surrounds the needle bar I5 and which oscillates during its displacement. The displacement of the slide 65 is derived from a grooved cam 61, keyed on the auxiliary shaft 38, and in which a pin 68 of a lever 18 engages, oscillatably mounted on a pin 69 on the machine frame 2. The oscillation imparted to the lever 10 by the grooved cam 61 is communicated to a two-armed lever 12, oscillatably mounted on a pin 1| on the machine frame, namely by means of a connecting clamping screw 13, which engages both in a slot 14 of the lever 12 and also in a slot 15 of the elbow lever 16. The free end of the lever 12 is connected by a screw 16 to a slide 11, guided shiftable in vertical direction on the machine head plate I. By means of a fork 18 the slide 11 carries a ring 19 loosely slipped on to the main tube 5, and on which a downwardly Cal extending arm is fixed. This arm 88 has a pin 8| engaging in an inclined slot 82, of the transverse slide 65. According to whether the elbow lever 18 is oscillated to the left or to the right during the rotation of the grooved cam 61, the ring 19, together with the arm 80, is either raised or lowered, and consequently the transverse slide 65 is shifted either to the left or to the right. This shifting of the slide 65 however results in a swinging out of the needle bar |5, together with the needle 83 carried thereby, as the needle bar I5 is guided in the eye 66 of the slide 65. The amplitude of the needle oscillation and consequently the length of stitch is adjustable, as can be easily seen, by displacing the connecting clamping screw 13.

In vertical grooves 84 in the slide guide 64 a slide 85 is guided, on which a small cloth presser 86 with oval supporting ring 81 and acting in the interior of the cloth feed ring 22, is exchangeably fixed. The slide 85 is generally pressed downwards by a spring 89 acting upon a screw bolt 88 of the slide 85 and consequently the cloth presser is pressed on to the cloth. The lifting of the cloth presser is effected by every rising of the needle by an abutment 90 provided on the needle bar and bearing from below against an abutment 9| on the slide 85.

A bearing bolt 92 for the filler reel 93 is also fixed on the flange 63 of the main tube 5. The filler 94 unwinding from the reel 93 is threaded through a hole 95 in the flange arm 96 and also through a groove 91 of the cloth presser ring 81, so that the cloth presser ring 81 bears on the filler 94 to be sewn. The stitching thread 98 (Fig. 4) is guided downwards in known manner in the interior of the hollow needle bar I5 and then fed to the needle eye, after passing through a hole 99 in the needle bar. The disengaging of the cloth feed is effected in known manner by a hand lever I09, pivotally mounted on the head plate I and carrying along, during its swinging up movement, the slide 21 which carries the cloth feeder 2|, 22.

The oscillating needle 83, as can be seen from Fig. 4, produces, during its oscillation from the right to the left, actually one stitch a, which extends axially to the oval cloth presser ring 81 and to circular cloth feed ring 22. Although during this stitch formation nocloth feed occurs, the individual stitches a are nevertheless directed at an angle to the filler 94, as the feed direction :ra: of the filler forms an acute angle 2 with the plane y-y of the needle oscillation. The stitches b, which are produced during the oscillation of the needle from the left to the right, are also directed at an angle to the filler 94, as during this stitch formation a feed, equal to the distance m, takes place. As for the formation of each zig-zag stitch composed of two stitches a and b only one feed m is required, it is evident, that the zig-zag stitches lie very close together, so that the filler can in practice be completely or almost completely covered by the stitching thread 98. The distance m of the cloth feed is adapted to be regulated in known manner by means of an adjusting screw, 43', acting on the slide 43 and adapted to be shifted vertically in a lug l' on the head plate I.

If it is desired, to make the zig-zag stitch slightly closer together or wider distant the one from the other, it is advisable, after suitably adjusting of the cloth feed, to select the angle a formed by the feed direction a:r and the needle plane y-y, correspondingly smaller or larger so that the zig-zag seam has a uniform appearance. In order to effect such an alteration of the angle 2, it is however only necessary to loosen the fixing by the oscillating needle or when the filler is,

entirely omitted and the closely arranged zig-zag stitches lie flat against the embroidery material according to the so-called flat embroidery work.

I claim:-

1. A sewing and embroidering machine, comprising in combination with the throat plate of the machine, an oscillatable needle, a cloth feeder adapted to swing out above said throat plate at an oblique angle to the oscillating plane of said needle, and means for swinging out said cloth feeder after each second needle oscillation.

2. A machine as specified in claim 1, comprising in combination with the needle, a needle bar carrying said needle, a rotatable main tube surrounding said needle bar, a slide guide on the lower end of said main tube, a transverse slide on said guide adapted to effect the oscillation of said needle, and a filler reel holder mounted on the lower end of said main tube near the needle.

3. A machine as specified in claim 1, comprising in combination with the main driving shaft of the machine and with the needle, a needle bar carrying said needle, a main tube surrounding said needle bar, a vertically shiftable tube inserted in said main tube, two cheeks on said vertically shiftable tube, a thickened portion on the upper end of said needle bar inserted between said cheeks, and a pin and slot connection adapted to rotatably connect said vertically shiftable tube to said main tube.

4. A machine as specified in claim 1, comprising in combination with the cloth feeder and the oscillatable needle, a main shaft, a cam on said shaft, a control element actuated by said cam adapted to swing said cloth feeder, an auxiliary shaft rotatable at half the speed of said main shaft, a plurality of cams on said auxiliary shaft, a needle oscillation control element actuated by one of said cams, and a control element adapted to raise and lower said cloth feeder actuated by a second of said plurality of cams adapted toalternately liberate said cloth feeder control element during one revolution of said main shaft and to arrest said cloth feeder control element during the next following revolution of said main shaft.

HUGO UNGER. 

